Device for preventing smoke in boiler-furnaces



Patented Nov. I, I898. w. R. MILLS. 4 DEVICE FOR PREVENTING SMOKE INBOILER FURNACES.

(Application filed Nov. 6, 1897.)

2 Sheets-Sheet I.

(No Model.)

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Patented Nov. I, I898.

w. R. MILLS. DEVICE FOR PREVENTING SMOKE IN BOILER FURNACES.

(Application filed Nov. 6, 1897.

2 Sheets-Sheet 2.

(No Model.)

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UNITED STAT S PATENT OFFICE.

.WILLIAM RILEY MILLS, OF JACKSON, MICHIGAN.

DEVICE FOR PREVENTING SMOKE lN BOILER-FURNACES.

SPECIFICATION forming part of Letters Patent No. 613,290, dated November1, 1898. Application filed November 6, 1897. Serial No. 657,698. (Nomodel.)

To aZZ whom, it may concern.-

Be it known that I, WILLIAM RILEY MILLs, a citizen ofthe United States,residing at J ackson city, county of Jackson, State of Michigan, haveinvented a certain new and useful Improvement in Devices for PreventingSmoke in Boiler-Furnaces, of which the following is a full, clear, andexact specification.

My invention has relation to a device forpreventing smoke inboiler-furnaces.

My object is to provide a device of this character which by reason ofits ability to produce perfect combustion in the boiler-furnace willovercome and prevent the generation and emission of smoke.

It is also my purpose to provide a device by means of which thenecessary amount of atmospheric air will be proportionately admitted tothe furnace as is required and disposed of with relation to the fire, soas to continually provide a uniform quantity of oxygen to thefurnace-fire at the location where it is needed, thereby maintaining auniform heat without causing smoke and as a result keeping the steam ata constant pressure.

Another object of my invention is to provide a device which may bereadily attached to and detached from a furnace without necessitatingany change in the wall of the furnace; and, finally, my object is toprovide a device which will be cheap to manufacture and durable andefficient in use.

Referring to the drawings forming a part of this specification, Figure 1is a perspective view of my device, showing it applied to a furnace.Fig. 2 is a sectional view of the same, showing the draft shut off. Fig.3 is an end view of the rotary drum. Fig. 4: is a sectional elevationshowing the draft full on, and Fig. 5 is a rear elevation of myinvention.

In the drawings, 1 indicates a furnace-wall of any well-knownconstruction, and 2 the usual fire-door, to which is hinged at 3 mysmoke preventer, having a handle 4 and catch 5, which are of simple andapparent construction and need not be described. A steam-pipe 6 from theboiler discharges, through short nozzles 7, jets of steam over the firefor a purpose which will hereinafter appear.

The door 8 of my device is provided with a liner 9, cut away for thereception of the rotary damper 10, which is journaled therein at 11.This cut-away portion is hollow and is provided with air ducts or flues13, which communicate with the upper air-receptacle 13 of the saidliner. It will be noted that the bottom 15 of the upper portion of theliner is provided with a series of perforations 16, whose use later willbecome evident. The top of the door is provided with a register 17,whose movement may be controlled by the finger I8.

As before stated, the rotary damper 10 is journaled in the sides 19 ofthe door and comprises two heads 20 and 21, to which are securelyattached by any suitable means airpartitions 22, said partitions beingbent so as to form angular air-passage ducts 23 24 25 26.

It will be observed that the heads 20 and 21 have each an angularsection 27 removed from their ends, while the central partition 22 hassecured to its outer face an operatinglever 28, having a pawl 29 adaptedto work in notches 30 of a segmental rack 31, which is bolted at 32 tothe front face of the door.

An apron 33 and bottom piece 34: serve to form a casing for the rotarydamper, as is plainly shown in Fig. 2 of the drawings.

In use the jet 7 is allowed to discharge steam into the fire-box, asrequired, while the amount of air necessary to insure perfect combustionis controlled by the operatinglever and the segmental rack hereinbeforealluded to.

By raising the lever to its full limit, as shown in Fig. 2, it isevident that air will not be admitted to the fire-box, while by loweringthe lever to the extremity of the segmental rack, as shown in Fig. 4,air is admitted in full quantity to the fire-box, the angular partitions22 serving to deflect the air in such manner that it will pass over thefire to the point required, thereby supplying a proper quantity ofoxygen at that location and causing perfect combustion, while at thesame time preventing the escape of unconsumed particles of carbon,smoke, gases, and other products of combustion.

Air is admitted to the liner by means of the register 17, as may berequired, the draft from the furnace causing the same to pass outthrough the d ucts 13 and as a result keeping the back of the door, aswell as the damper and its sections, cool, thereby preventing warping orcracking of that portion of the device.

I claim- 1. Asmoke-preventer, comprisinga casing, a liner in saidcasing, a perforated rotary damper in said liner having partitionstherein, and means for regulating the flow of air through the damper andliner.

2. A smoke-preventer comprising a casing, a liner in said casing,provided with a register, a perforated rotary damper having partitionstherein and means for regulating the flow of air through the damper.

3. A smoke-preventer comprising a casin g,

- a liner in said casing, a perforated rotary damper having partitionstherein, and means comprising a rack and, lever for operating thedamper.

t. A smoke-preventer comprising a casing, a liner in said casing,provided with a register, a perforated rotary damper having partitionstherein, and means for operating the same, comprising a segmental rackand lever, attached to the damper.

5. A smoke-preventer comprising a casing, a liner in said casingprovided with air-duets, a register connecting with said ducts, aperforated rotary damper below the register, and means for operating thedamper.

6. A smoke-preventer comprising a casing, alinerin said casing, providedwith air-ducts, a register in said liner, perforations in the liner,adapted to register with the air-partitions in the damper, and means forcontrolling the flow of air from the damper to the furnace.

7. Asmoke-preventer, comprisinga casing, a liner therein, provided withair-ducts, a register connecting with said air-ducts, perforations inthe bottom of the liner below the register adapted to register with theair-partitions in the rotary damper, and means for controlling the fiowof air from the damper to the furnace.

8. A smoke-preventer comprising a casing, a liner therein, provided withai r-ducts, a register connecting with said air-ducts, perforations inthe bottom of the liner below the register adapted to register with theair-partitions in the rotary damper and means for controlling the fiowof air from the damper, to the furnace, comprising alever secured to thedamper, and engaging with a rack.

9. A smoke-preventer comprising a door, a casing, a liner therein,provided with airducts, a register located above and connecting withsaid air-ducts, perforations in the bottom of the liner below theregister adapted to register with the air-partitions in the damper andmeans for controlling the flow of air to the furnace comprising asegmental rack secured to the door and an operating-lever attached tothe damper.

10. In a smoke-preventing apparatus the combination of a furnace-door,containing a perforated rotary damper having partitions therein, withsteam-jets directed upon the area of combustion of the grates.

In testimony whereof I affix my signature in presence 01": twowitnesses.

WVILLIAM RILEY M ILLS.

Witnesses:

J. BUEHLER, L. DAVIS.

